I have four out of my six chickens that are moulting, two of them heavily. We live in New England and it has been rather nippy here at night. Normally my girls can handle the cold no problem. But since they've been moulting they have been a little cold. The moulting hens spend a good part of the day in the coop except when they want to eat. So I came up a very inexpensive idea for a simple but effective heater. Also check out my videos on my water heater and chicken feeder.